/// <summary>
/// Listens for messages received from the service and handles them appropriately.
/// </summary>
/// <param name="webSocket">The connected WebSocket on which to listen for the message.</param>
/// <param name="requestId">The request ID associated with the conversation.</param>
/// <param name="token">A task cancellation token.</param>
/// <returns>A Task representing the asynchronous operation.</returns>
private async Task ReceiveAsync(WebSocket webSocket, string requestId, CancellationToken token)
{
try
{
while (webSocket.State == WebSocketState.Open && !token.IsCancellationRequested)
{
var speechServiceMessage = await this.ReceiveMessageAsync(webSocket, requestId, token);
if (speechServiceMessage is SpeechPhraseMessage)
{
RecognitionResult phraseResponse = new RecognitionResult((SpeechPhraseMessage)speechServiceMessage);
this.OnResponseReceived?.Invoke(this, new SpeechResponseEventArgs(phraseResponse));
}
else if (speechServiceMessage is SpeechHypothesisMessage)
{
PartialRecognitionResult partialResponse = new PartialRecognitionResult((SpeechHypothesisMessage)speechServiceMessage);
this.OnPartialResponseReceived?.Invoke(this, new PartialSpeechResponseEventArgs(partialResponse));
}
else if (speechServiceMessage is SpeechFragmentMessage)
{
PartialRecognitionResult partialResponse = new PartialRecognitionResult((SpeechFragmentMessage)speechServiceMessage);
this.OnPartialResponseReceived?.Invoke(this, new PartialSpeechResponseEventArgs(partialResponse));
}
else if (speechServiceMessage is TurnEndMessage || speechServiceMessage == null)
{
// End of turn - stop listening
break;
}
}
}
catch (WebSocketException e)
{
this.RaiseTranslateError(e);
}
catch (OperationCanceledException)
{
}
finally
{
await this.CloseConnectionAsync(webSocket);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="PartialSpeechResponseEventArgs"/> class.
/// </summary>
/// <param name="partialResult">The partial speech recognition result text.</param>
internal PartialSpeechResponseEventArgs(PartialRecognitionResult partialResult)
{
this.PartialResult = partialResult;
}